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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291571317a677448719f9382f5985d8efe89be8f108fe5ff0f71c234e57c4e58' 
  AND token = 'otd3HYk4ZtndFgLnGVV4J7jd2LEztbw8V+AlmoRZL7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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