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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da096afb50bd207f202515d57b6dd45bf009a3b5fe29aeed9f0d916d7361f135' 
  AND token = 'WqoMGWDpGWUGUkz5oO9Nf+UhqgMfAwHjWBqVq6Lq1gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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