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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f16d5be2818d27d7d4839b71a002dacea98fdbe51138b9e95b76bc0b34b91f' 
  AND token = '9QbLrmf03dvUbe2327a0Gegj8jv9218RU1Fe7R1qjpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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