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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead184bd33f2d65c8653cec7aedaa9c5c489b30b0da35fa4ff88fa0264b3d0d5' 
  AND token = 'nq4teRdDLXVZpyJfUyD6m5e2QEDRCzffp2QFQbnzm3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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