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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39488613f0f740fd4d1ab5333c55dc55e3563792c171124936675f35431377d5' 
  AND token = 'Dm8F1moqTmz6vpDfUb1xCGow+5FyS9HJSsySfHQeZAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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