SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57db92cb566bb4038f507e712889ef0a488b41b31d2ec80f658f0b02047a562a' 
  AND token = 'M3yTXA5s1+hmDClwNvKu4VUn5eVj+hhJ2zrrhvyts9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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