SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a37e195873919b85af7f020afd0ec0e9d6524dea5db40d09871f6078010632e' 
  AND token = 'A/43eY/1d7yTnxFxuB9TL/hqhHk/ALgFnTKybL2QWy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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