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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e473ad17a08a3a17a56356dbf0319bc11222755907ee0af97746caacdfacd9' 
  AND token = 'kFze8lRJGOpl+CdqIIn8E/1P1DCcm87Y/zj/Ul8Nb6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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