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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79dcb63c2a95d9ac2226c4e59722378642c6fa36e8705d09a54a96322449b36' 
  AND token = 'srjLdiV8cBi0TvrEdLUUZ95d0Ykpdjelf7DCvrhLR+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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