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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30045d2a20150f091b838831317ea691db2603fe48273a8dfd168f3f01de901a' 
  AND token = 'pkCqdfSdyo9E2gihJ+FWoqe2sod2NfDLtX8EC8y4DxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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