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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f82060a50caaf9bcb98e1a6cfe06362eaafd1dac43fe239c599b4e546756f8' 
  AND token = 'o7tcWzl5Qurjwfey3q3ytfwZQ+WC90x+jYNoq25XSVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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