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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b909b03ad4a12a031f6c07f8016cdb01b2f55ead1c092834ee667ec8b58ed2' 
  AND token = '5w6rOOeFJtZe+X2HIfZ4dT7k6elewkXMKjrPgjxPdj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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