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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4e49c4e953f4af7050b8ef78631b60a5c2b20fc2d31fd3669320fc2c798028' 
  AND token = 'yr7bAEt93/WU8ItMfPGHFQHHtIxXW7TlhRXhRNvsZwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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