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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1031f0b417f1921e238906611911e8bb86cb1bbe7a4b5db500f6c878bf47e681' 
  AND token = '+2fGoF0ZTsalMHgYrCAU9FC71yTtO6+Bu9Kb4lekfII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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