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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f04a0f57e6fe3a9ef665ee1bf0c74a8b5abd6581871ec24701a0dd47f13c84b' 
  AND token = 'XOlNP/GBc1YqnJo9i8bkONCJgb3rEn+o+0lTVp1+rLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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