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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6405168e8f3600bb4a7a3594507cd9751189520b170b23fdb47fadede956bde' 
  AND token = '/oH+bV/rQpisePeuiX6JZGklkzGaZbW0caA3rWuM5Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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