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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5ac6c668d4368b1cd51fc272a04e316e02f34f175f01f8551b7539516ef936' 
  AND token = 'frrWjfE2k6OC9kfQenANjI5GVaTCoxn8fnwzSK7JcaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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