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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9f09fc0eee179be9f416334d9334216fd9306f909ddfd59f029019736da252' 
  AND token = 'UqrWza7drLWqrUcL9pzs4gK2l0A5FlRgaTcqfFCGjT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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