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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70661d1ffd0c6ec7d898deb1ac43dc4a3f1ae41c5fcd7fdf000bb42471d6f62' 
  AND token = 'OW4k7Iwz4fqt5TTav4LvDRvCsWAKSZYBW0JwxlJt4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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