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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13998942b4308379fb64fbfa4e4d107349ea229ecfbcae31eb6a606f7a73032e' 
  AND token = '1TUQbqQizCyHFqOb2wd5HOpdch8aDMl1iWia8g7a870=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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