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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a4e483666fca56df7ad908cfbb7c0c1ef456f3b953b983348d902ca1830a2e' 
  AND token = 'pC4kmnyIUX1EQBWgVtT7ZC/wN5kupNAD+4j9v6Va2E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}