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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f02d8e87fbdb4a484ec63905f9f163f1a41efbd7cc33b9566f34065749b8c29' 
  AND token = 'LZF3sAZYkA70Aarn8eu9f6RLwUYyUsIvoUZd8LB8xTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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