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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8518de0e5f905c5d24f2f9eab4871ec56c9a6a173180adb3fa4f70227f5a30a' 
  AND token = 'BdfgpHWcn7Ha6WtGloDGUV0H1KGD4pmqO2vXVg4JFpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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