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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cd29b9daba3044927c4c8a71e4d46952ad5236eade4beb69d198f0b638b4d8' 
  AND token = 'cD9j9vlC4FuFPuKFTFwxq6m6oedzc0XuHcvn3HHKCJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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