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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca641f4700cb7322508ed17bec579dad64117d2c8dafab3354f3bd221c59d29' 
  AND token = 'fIz89ChGZOi3v/VeqKDL0sv8oV05AsSeCu8kNHMWtiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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