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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e0c33c8ac579cffb7fc46aa878107e318789c4b3fc6c4f3f7107acaa37b54a' 
  AND token = '72BXBqXd3PAR770sVR6alpXKvSK1i8XX/08Q6vqRxnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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