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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad8e52754c5625cc8f7994a796d19c2004209fbae11cef0cce380fff088e622' 
  AND token = 'V4pCtpSLgTYNLKXIHY6Ug1/J1TWaf9OmqqSTfclYDqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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