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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bed241815fb21ac9388a21f48fb7bad904ce2905efe9e3dd3ac15351a6d96a' 
  AND token = 'xkPfjjTK46o7Flq3H+AfRWGdSFc0/mN37fm5FgVNZdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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