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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f05c8a5f08e7a73abf4eec0f953a23a1488e15c4eafd78a8c44f751d8eed5ff' 
  AND token = 'xe1rX6eoAvx9I1cvJSt5FklnI27Ov5sx9tRVO4mH8RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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