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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30805f300c073a1844edc97ea9d6a78fd778542d56aecc73629b9c4a4980856f' 
  AND token = 'doNwA9HcVRNLA0jlCPz4PqRbwO/6hAQjNm8Uqf0zvyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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