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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8927c783e24a81d172cdd6d8717de0dc86211d0877e40e430c636b72c6ea18d7' 
  AND token = '0W+Itp9wkvG4I+vO4HNVdSkrD+DGE9h17Hr3kB+sW+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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