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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73adc5d929dcd9ed6a259dd26660ce1dfe5ccc465080a73197d469ef3e6cc874' 
  AND token = 'PwIXGODw1oXBn2ZOOkUStdfaZrMPtOeQcQPrVDGrX9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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