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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941dfd523c88d05b8b79b6fe815698fe222f551c6f7b8dde603b6282994abbaa' 
  AND token = 'cd0CHrpV9WnHNad8rlGIeedGxtOiU9epv/KPsdwZMEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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