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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764e7a6933338073dec82ff2d45ef6ccad086a7963c28c7d7c795cb74bbf2c41' 
  AND token = 'htfiS5GBjcZyn5+RLkr/l7gGzVUy19eIk143lpYEdCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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