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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ae09fea951b00807e377a02765a8d6b12ca109cf73e55a5eb0059eee802f3a' 
  AND token = 'eBPF/3LQkxQGCpoXspKRye90JkbGHlWYatGfXcDygNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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