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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc143243768360369dac263ab55bd98830b423f704b6da67147ad790b7e5ba5f' 
  AND token = 'KQZVo0oqjSoQryM1uaVig8oQ9LiPMSNRq1mvH0iCX34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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