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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2525fb8c963600130473b1fa829853ebf381fa88b53d85dd776a7664a8076eb' 
  AND token = 'fGBc7N5C/xATTh3y9Hjkz5N7ePbDQWAAJ6Z9J75Qf7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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