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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dff06a7a0089e062cbf2a317487ccd89d77dcd4d671db3b852242d5396a21f' 
  AND token = '9fs3ebXLwJYk/7Pow8potqPsd2VCuNQiDSWdrIar798=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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