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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e029fab455cf5f8b5130bc674498db28bce6fbf6aa1fc3d462429f919f8e1542' 
  AND token = '2CzQgxkMuzQlHHvjz988zE58f6wxwZF17NwbLJs1h2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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