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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed1038ccfaa59bb521a49ff850542647df33d5d33bba28d7f77f010c5a4bb7d' 
  AND token = 'QZrtnTC3+XmopOjACQfJ5k05cRPBfijne+1yY+gn/AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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