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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b4ea41dc9d77bf9754271f94d601f1819222a19146872cae392f8ca8959a93' 
  AND token = '+qN6QYCdQsZlKj9hYvIOBIbpalxv+Oso22cRcEqnBcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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