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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d92155f159d64436bd215a0fa8c60de13d316a2f6856f1b32b6548d9d32c71a' 
  AND token = 'baWKxy9RQHmWiEBXxuMN7VwWxwPUE3GhPdy+WX8eZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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