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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcf2bbae9a8d86517e3366dfaebb9fec4fac1231b7e75091946e5cf0cc4ab1d' 
  AND token = '+AX+e7yZQ9Xf6Z79+hVLtfj4JeJsvA1tV664uKgMVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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