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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e2517127762fa0bd8fd2ecdbef47f47195172c14005d3cbaa479ff8ef7f416' 
  AND token = 'l9/to7cFyF23/jh+Yw8njBmUATNimmjm2raCZQDW4XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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