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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e16e5c74978fc7f98bbd0fa69d79399f9387e331e56717e651f885c25899e65' 
  AND token = 'bpnxEeo6bEd2UlBuIZMYKhPu1dEr2iTQRn9rXe6bdPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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