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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3c6a4573e42ab2eb0a9df94d485a099905d4c36a1b43c7ca43998614e34f9e' 
  AND token = 'fUva6YX5xfPiiQvAVBvwFuaWE5t8Hp63rg+kpQS6orw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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