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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e41576b1546c9cd25d0dc7805fd4f6fca3e125e481318b74f8c0c6aa38b4fe9' 
  AND token = 'Fug8kxAdxXsHILSDsCpIcAPq0G2YRzSNSNmh1TBQq6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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