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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83c9cb2af36cd1d2b04e143096d8aa831d50699678638a90b8a89e085b7b490' 
  AND token = 'MSaLOrrmg0rFZu+jHxCIPNo7Yhh+8WRb2VeTLBbQhbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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