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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f3f65c9fc55956d7d7b2701d51698efb0397ac2a6499d2433f4b927a66bd5c' 
  AND token = 'rfTEw6kqD/Fi7osuRDKlPRgMey5y0JfRf8xqMes8RM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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