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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c7ccca64c639c3953d90f89244c5c8ac9cb9ab251ebec0750740863b6a15c7' 
  AND token = '1Hx0XPLLsg+xJO/w3xKV/VrK1cqfoCnO+4S894wDgnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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