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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c05a3ee89572dc41219dff0777a90adfc3097f0c157b81b577d866e80e91659' 
  AND token = '8HDEcMeKe82cWABvBHhjLwg6zWmdCCYT5vCYgYtdhYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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