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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd645218d285fa31452f80a57aa31bd05938eafaa3fd45acd193ff693606ba46' 
  AND token = 'VdSiSRq/c8SI37QPiBoVlytmkp9F/K/W5Rlisn86z+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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