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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b127772d0ca2fbfbc77d47c569e52d40de337e94fd795fa0e32c5eb821ca2836' 
  AND token = '0v+3uWJMDm/NVns4DzHg6BmJCyV9+scHBc9tKzT1gD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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