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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596d87a518a92205608482b8a0574a43604480fe176a8cfad513bf59085ad0d5' 
  AND token = 'bxGlVMMYzej14U7e/A9WNJ6po75hT4BEImEV4AJ5JUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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