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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219fd9f2fe3cc3c693046bd282a09d5678fa46d17927d8e4f93bb27289afa6dc' 
  AND token = 'uAM9+1pM0owlwZldY9Ue78FxfUF5tnVs66n5ZFVN35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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