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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc45e5964ccb7a21ade5f9e77506a35e208e45574fd5c9f61b0b16f5e8d43314' 
  AND token = 'X0GQitEu5kUGrDDMSWtFtloYcpQVDFN9A2zoNy9LRy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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