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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6fae232f37f59f161d49b5c4a0532584ca22b96e2d3d4721cc415dc0fb0393' 
  AND token = '6EvxFGuspz99wQ4NS/QSuq4gIvNHAJkzHk/O7W/1rEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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