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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f29de5af2fdb932d1322edd52f7b65e674f05e55e137ae845fcfa054abb7808' 
  AND token = 'KDJbd3gLjkXcVWfwFMifNoVIfaWJN2SRVYSMRVi5qKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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