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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591d8f379ffa8050f11c0126d59b8d837d08fe062f4146fe6ddc56add9eb5fbd' 
  AND token = 'YCHxJR8bDrlAjDM9s4IkrKkqGGZD2mglnPbt4a04h38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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