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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a521bbef8cdcb88fe12340a07a589057a674dbc5d77538a88e32ac45dfe7c86' 
  AND token = 'p1yinzyb9BhfrL/X4s43R3Y0N4C+oYcf6ih01ew+yZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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