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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed17114a9e4827575579c448494f0bb31274b6c6c9269119344091fe3d5fc57e' 
  AND token = 'ioM+wLVwHntQQ9FnaO5eDM9LdouyAterw5kV/5h5kB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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