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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a8a7ff53ee9b6105b66c1e7d3bb995139df932946d23c4d29c70d3981f4747' 
  AND token = 'Uky+4Wf46V8ot7F6m6QWi/pvSUJDONcveTUh4oPUfIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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