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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a3197da0090478cb0a379850439b512033b4c03103bae9626e43afb7fa3def' 
  AND token = 'a1EbKJ7B86rzKhxxeNh4VAGyqNLspdfl1xVxNCOjVZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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