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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bccb03f93e33562d1c8e5985f18ddbaf8d1748d733b063875cb96c8ed3e18ed' 
  AND token = 'oagcJx93pq7ExuaMND9MZQKufiY+izLWJizCfY711IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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