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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d56cb405cc98de29de645197214de0fd19e2a9b1ffa3840931a6785a6e97e4' 
  AND token = 'wx/epgMDr8c0/3V6245aEHQw9aghD8ZRihyeeybDogY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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