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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdd33bfaa8aed132fe885461a7d53e94b2030358dbb4e6c6678cb5fab41212d' 
  AND token = 'AdpO5mV2BKJacv0499aADQt5Y2XWKqt8q2s4mJPmgvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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