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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935aa473a016ad24e67b5f922e319475983be7d2a6e45bd1bcd201b1cfd29787' 
  AND token = 'aAx9PFbs9SRE9SwbmuU7eQgqdfQuyw996zaWEc9WymI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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