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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f6b4f7993248166529990e2166591d9acf39a5f54ee2951813f07fb91cc4c8' 
  AND token = 'JhCxyBNdm9dGO3p+m1Rx+Mp3tJPWNiggzSoFxp96oNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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