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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad83a1c3004176f8c9ba1c6d8ec6e4373f6a6a4706132044a375d3e46a72c9af' 
  AND token = '9+Ky74eTsgk1FWMwLvziVI2+FbNbc7ntVrpTxQBoqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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